Add taproot activation parameters

bip-0341.mediawiki

@@ -298,6 +298,14 @@ This BIP is deployed concurrently with [[bip-0342.mediawiki|BIP342]].
 
 For Bitcoin signet, these BIPs are always active.
 
+There may be multiple deployment attempts of these BIPs.
+
+The first deployment will use BIP 8 with the name "taproot", using bit 2, and a lockinontimeout of false.
+
+For Bitcoin mainnet, the BIP 8 startheight will be 681408 (approximately May 1st 2021), the timeoutheight will be 695520 (approximately August 6th 2021), the minimum_activation_height will be 709632 (approximately November 12th 2021), and the activation threshold will be 1815 out of 2016 blocks (90%).
+
+For Bitcoin testnet, TBD.
+
 == Backwards compatibility ==
 As a soft fork, older software will continue to operate without modification.
 Non-upgraded nodes, however, will consider all SegWit version 1 witness programs as anyone-can-spend scripts.